2013: Stewart scores 48th career NASCAR victory (currently his last) with win at Dover, Delaware, in June. Stewart breaks his right tibia and fibula when he hits a lapped car and flips during the 30-lap American Sprint Car Series feature in August at Southern Iowa Speedway in Oskaloosa, Iowa. Stewart misses the remainder of the NASCAR season.

August 2014: At a race at the Canandaigua (New York) Motorsports Park, Stewart’s car hits and kills sprint-car driver Kevin Ward Jr., who exited his car and appeared to confront Stewart. The 25-lap race was under caution when Ward was struck. Stewart’s car was behind another, which swerved to avoid the driver, before he hit Ward.

September 2014: A 23-person Ontario County grand jury declines to indict Stewart on either of two charges: manslaughter in the second degree and criminally negligent homicide.

August 2015: Family of Kevin Ward Jr. files wrongful death lawsuit against Stewart.

Sept. 30, 2015: News conference planned for Stewart. He is expected to formally announce his retirement from NASCAR racing after the 2016 season.